Meanwhile, the mother of twins Patrick and Thomas has done her own sifting and come to her own conclusions. She says her son's feminine behavior suggests he will grow up to be gay, and she has no problem with that. She just worries about what happens to him between now and then.
After that fateful call from Patrick's school, she says:
"I knew I had to talk to my son, and I had no clue what to say."
Ultimately, she told him that although he could play however he wanted at home, he couldn't tell his classmates he was a girl, because they'd think he was lying.
And she told him that some older boys might be mean to him and even hit him if he continued to claim he was a girl.
Then she asked him:
"Do you think that you can convince yourself that you are a boy?"
"Yes, Mom," he said. "It's going to be like when I was trying to learn to read, and then one day I opened the book and I could read."
His mother's heart sank.
She could tell that he wanted more than anything to please her. "Basically, he was saying there must be a miracle - that one day I wake up and I'm a boy. That's the only way he could imagine it could happen."
In the year since that conversation, Patrick's behavior has become somewhat less feminine. His mother hopes it's just because his interests are evolving and not because he's suppressing them.
"I can now imagine him being completely straight, which I couldn't a year ago," she says. "I can imagine him being gay, which seems to be statistically most likely."
She says she's fine with either outcome, just as long as he's happy and free from harm. She takes heart in how much more accepting today's society is.
"By the time my boys are 20, the world will have changed even more."
By then, there might even be enough consensus for researchers to forget about finger lengths and fruit flies and gay sheep, and move on to a new mystery.